Convenor: Gufran Beig (India)
Co-Convenor: Jan Lastovicka  (Czech Republic)

Greenhouse gases and other drivers cause long-term trends at higher levels in the atmosphere and ionosphere, which are much stronger than tropospheric trends. Papers on progress in investigating trends in the stratosphere, mesosphere, thermosphere and ionosphere, dealing with ground-based as well as satellite-borne observations, model simulations, theoretical analyses, statistics and methods of  determination of trends, and laboratory experiments, are welcome.

Particular attention should be paid to papers dealing with open problems or contradictory results like trends in ion temperatures, thermospheric density or atmospheric waves, to papers oriented to synthesis of various results, and to papers dealing with modeling long-term trends.